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qemu/hw/virtio-serial-bus.c
Alon Levy bc6b815d9e virtio-serial: propagate guest_connected to the port on post_load 
When migrating a host with with a spice agent running the mouse becomes
non operational after the migration due to the agent state being
inconsistent between the guest and the client.

After migration the spicevmc backend on the destination has never been notified
of the (non 0) guest_connected state. Virtio-serial holds this state
information and migrates it, this patch properly propagates this information
to virtio-console and through that to interested chardev backends.

rhbz #725965

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Message-id: 1364292483-16564-11-git-send-email-hdegoede@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-03-27 10:26:50 -05:00

1019 lines
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/*
* A bus for connecting virtio serial and console ports
*
* Copyright (C) 2009, 2010 Red Hat, Inc.
*
* Author(s):
* Amit Shah <amit.shah@redhat.com>
*
* Some earlier parts are:
* Copyright IBM, Corp. 2008
* authored by
* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu/iov.h"
#include "monitor/monitor.h"
#include "qemu/queue.h"
#include "hw/sysbus.h"
#include "trace.h"
#include "hw/virtio-serial.h"
static VirtIOSerialPort *find_port_by_id(VirtIOSerial *vser, uint32_t id)
{
VirtIOSerialPort *port;
if (id == VIRTIO_CONSOLE_BAD_ID) {
return NULL;
}
QTAILQ_FOREACH(port, &vser->ports, next) {
if (port->id == id)
return port;
}
return NULL;
}
static VirtIOSerialPort *find_port_by_vq(VirtIOSerial *vser, VirtQueue *vq)
{
VirtIOSerialPort *port;
QTAILQ_FOREACH(port, &vser->ports, next) {
if (port->ivq == vq || port->ovq == vq)
return port;
}
return NULL;
}
static bool use_multiport(VirtIOSerial *vser)
{
return vser->vdev.guest_features & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
}
static size_t write_to_port(VirtIOSerialPort *port,
const uint8_t *buf, size_t size)
{
VirtQueueElement elem;
VirtQueue *vq;
size_t offset;
vq = port->ivq;
if (!virtio_queue_ready(vq)) {
return 0;
}
offset = 0;
while (offset < size) {
size_t len;
if (!virtqueue_pop(vq, &elem)) {
break;
}
len = iov_from_buf(elem.in_sg, elem.in_num, 0,
buf + offset, size - offset);
offset += len;
virtqueue_push(vq, &elem, len);
}
virtio_notify(&port->vser->vdev, vq);
return offset;
}
static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev)
{
VirtQueueElement elem;
if (!virtio_queue_ready(vq)) {
return;
}
while (virtqueue_pop(vq, &elem)) {
virtqueue_push(vq, &elem, 0);
}
virtio_notify(vdev, vq);
}
static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq,
VirtIODevice *vdev)
{
VirtIOSerialPortClass *vsc;
assert(port);
assert(virtio_queue_ready(vq));
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
while (!port->throttled) {
unsigned int i;
/* Pop an elem only if we haven't left off a previous one mid-way */
if (!port->elem.out_num) {
if (!virtqueue_pop(vq, &port->elem)) {
break;
}
port->iov_idx = 0;
port->iov_offset = 0;
}
for (i = port->iov_idx; i < port->elem.out_num; i++) {
size_t buf_size;
ssize_t ret;
buf_size = port->elem.out_sg[i].iov_len - port->iov_offset;
ret = vsc->have_data(port,
port->elem.out_sg[i].iov_base
+ port->iov_offset,
buf_size);
if (port->throttled) {
port->iov_idx = i;
if (ret > 0) {
port->iov_offset += ret;
}
break;
}
port->iov_offset = 0;
}
if (port->throttled) {
break;
}
virtqueue_push(vq, &port->elem, 0);
port->elem.out_num = 0;
}
virtio_notify(vdev, vq);
}
static void flush_queued_data(VirtIOSerialPort *port)
{
assert(port);
if (!virtio_queue_ready(port->ovq)) {
return;
}
do_flush_queued_data(port, port->ovq, &port->vser->vdev);
}
static size_t send_control_msg(VirtIOSerial *vser, void *buf, size_t len)
{
VirtQueueElement elem;
VirtQueue *vq;
vq = vser->c_ivq;
if (!virtio_queue_ready(vq)) {
return 0;
}
if (!virtqueue_pop(vq, &elem)) {
return 0;
}
memcpy(elem.in_sg[0].iov_base, buf, len);
virtqueue_push(vq, &elem, len);
virtio_notify(&vser->vdev, vq);
return len;
}
static size_t send_control_event(VirtIOSerial *vser, uint32_t port_id,
uint16_t event, uint16_t value)
{
struct virtio_console_control cpkt;
stl_p(&cpkt.id, port_id);
stw_p(&cpkt.event, event);
stw_p(&cpkt.value, value);
trace_virtio_serial_send_control_event(port_id, event, value);
return send_control_msg(vser, &cpkt, sizeof(cpkt));
}
/* Functions for use inside qemu to open and read from/write to ports */
int virtio_serial_open(VirtIOSerialPort *port)
{
/* Don't allow opening an already-open port */
if (port->host_connected) {
return 0;
}
/* Send port open notification to the guest */
port->host_connected = true;
send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1);
return 0;
}
int virtio_serial_close(VirtIOSerialPort *port)
{
port->host_connected = false;
/*
* If there's any data the guest sent which the app didn't
* consume, reset the throttling flag and discard the data.
*/
port->throttled = false;
discard_vq_data(port->ovq, &port->vser->vdev);
send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 0);
return 0;
}
/* Individual ports/apps call this function to write to the guest. */
ssize_t virtio_serial_write(VirtIOSerialPort *port, const uint8_t *buf,
size_t size)
{
if (!port || !port->host_connected || !port->guest_connected) {
return 0;
}
return write_to_port(port, buf, size);
}
/*
* Readiness of the guest to accept data on a port.
* Returns max. data the guest can receive
*/
size_t virtio_serial_guest_ready(VirtIOSerialPort *port)
{
VirtQueue *vq = port->ivq;
unsigned int bytes;
if (!virtio_queue_ready(vq) ||
!(port->vser->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) ||
virtio_queue_empty(vq)) {
return 0;
}
if (use_multiport(port->vser) && !port->guest_connected) {
return 0;
}
virtqueue_get_avail_bytes(vq, &bytes, NULL, 4096, 0);
return bytes;
}
static void flush_queued_data_bh(void *opaque)
{
VirtIOSerialPort *port = opaque;
flush_queued_data(port);
}
void virtio_serial_throttle_port(VirtIOSerialPort *port, bool throttle)
{
if (!port) {
return;
}
trace_virtio_serial_throttle_port(port->id, throttle);
port->throttled = throttle;
if (throttle) {
return;
}
qemu_bh_schedule(port->bh);
}
/* Guest wants to notify us of some event */
static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
{
struct VirtIOSerialPort *port;
VirtIOSerialPortClass *vsc;
struct virtio_console_control cpkt, *gcpkt;
uint8_t *buffer;
size_t buffer_len;
gcpkt = buf;
if (len < sizeof(cpkt)) {
/* The guest sent an invalid control packet */
return;
}
cpkt.event = lduw_p(&gcpkt->event);
cpkt.value = lduw_p(&gcpkt->value);
trace_virtio_serial_handle_control_message(cpkt.event, cpkt.value);
if (cpkt.event == VIRTIO_CONSOLE_DEVICE_READY) {
if (!cpkt.value) {
error_report("virtio-serial-bus: Guest failure in adding device %s",
vser->bus.qbus.name);
return;
}
/*
* The device is up, we can now tell the device about all the
* ports we have here.
*/
QTAILQ_FOREACH(port, &vser->ports, next) {
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_ADD, 1);
}
return;
}
port = find_port_by_id(vser, ldl_p(&gcpkt->id));
if (!port) {
error_report("virtio-serial-bus: Unexpected port id %u for device %s",
ldl_p(&gcpkt->id), vser->bus.qbus.name);
return;
}
trace_virtio_serial_handle_control_message_port(port->id);
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
switch(cpkt.event) {
case VIRTIO_CONSOLE_PORT_READY:
if (!cpkt.value) {
error_report("virtio-serial-bus: Guest failure in adding port %u for device %s",
port->id, vser->bus.qbus.name);
break;
}
/*
* Now that we know the guest asked for the port name, we're
* sure the guest has initialised whatever state is necessary
* for this port. Now's a good time to let the guest know if
* this port is a console port so that the guest can hook it
* up to hvc.
*/
if (vsc->is_console) {
send_control_event(vser, port->id, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
}
if (port->name) {
stl_p(&cpkt.id, port->id);
stw_p(&cpkt.event, VIRTIO_CONSOLE_PORT_NAME);
stw_p(&cpkt.value, 1);
buffer_len = sizeof(cpkt) + strlen(port->name) + 1;
buffer = g_malloc(buffer_len);
memcpy(buffer, &cpkt, sizeof(cpkt));
memcpy(buffer + sizeof(cpkt), port->name, strlen(port->name));
buffer[buffer_len - 1] = 0;
send_control_msg(vser, buffer, buffer_len);
g_free(buffer);
}
if (port->host_connected) {
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1);
}
/*
* When the guest has asked us for this information it means
* the guest is all setup and has its virtqueues
* initialised. If some app is interested in knowing about
* this event, let it know.
*/
if (vsc->guest_ready) {
vsc->guest_ready(port);
}
break;
case VIRTIO_CONSOLE_PORT_OPEN:
port->guest_connected = cpkt.value;
if (vsc->set_guest_connected) {
/* Send the guest opened notification if an app is interested */
vsc->set_guest_connected(port, cpkt.value);
}
break;
}
}
static void control_in(VirtIODevice *vdev, VirtQueue *vq)
{
}
static void control_out(VirtIODevice *vdev, VirtQueue *vq)
{
VirtQueueElement elem;
VirtIOSerial *vser;
uint8_t *buf;
size_t len;
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
len = 0;
buf = NULL;
while (virtqueue_pop(vq, &elem)) {
size_t cur_len;
cur_len = iov_size(elem.out_sg, elem.out_num);
/*
* Allocate a new buf only if we didn't have one previously or
* if the size of the buf differs
*/
if (cur_len > len) {
g_free(buf);
buf = g_malloc(cur_len);
len = cur_len;
}
iov_to_buf(elem.out_sg, elem.out_num, 0, buf, cur_len);
handle_control_message(vser, buf, cur_len);
virtqueue_push(vq, &elem, 0);
}
g_free(buf);
virtio_notify(vdev, vq);
}
/* Guest wrote something to some port. */
static void handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIOSerial *vser;
VirtIOSerialPort *port;
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
port = find_port_by_vq(vser, vq);
if (!port || !port->host_connected) {
discard_vq_data(vq, vdev);
return;
}
if (!port->throttled) {
do_flush_queued_data(port, vq, vdev);
return;
}
}
static void handle_input(VirtIODevice *vdev, VirtQueue *vq)
{
}
static uint32_t get_features(VirtIODevice *vdev, uint32_t features)
{
VirtIOSerial *vser;
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
if (vser->bus.max_nr_ports > 1) {
features |= (1 << VIRTIO_CONSOLE_F_MULTIPORT);
}
return features;
}
/* Guest requested config info */
static void get_config(VirtIODevice *vdev, uint8_t *config_data)
{
VirtIOSerial *vser;
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
memcpy(config_data, &vser->config, sizeof(struct virtio_console_config));
}
static void set_config(VirtIODevice *vdev, const uint8_t *config_data)
{
struct virtio_console_config config;
memcpy(&config, config_data, sizeof(config));
}
static void guest_reset(VirtIOSerial *vser)
{
VirtIOSerialPort *port;
VirtIOSerialPortClass *vsc;
QTAILQ_FOREACH(port, &vser->ports, next) {
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
if (port->guest_connected) {
port->guest_connected = false;
if (vsc->set_guest_connected) {
vsc->set_guest_connected(port, false);
}
}
}
}
static void set_status(VirtIODevice *vdev, uint8_t status)
{
VirtIOSerial *vser;
VirtIOSerialPort *port;
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
port = find_port_by_id(vser, 0);
if (port && !use_multiport(port->vser)
&& (status & VIRTIO_CONFIG_S_DRIVER_OK)) {
/*
* Non-multiport guests won't be able to tell us guest
* open/close status. Such guests can only have a port at id
* 0, so set guest_connected for such ports as soon as guest
* is up.
*/
port->guest_connected = true;
}
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
guest_reset(vser);
}
}
static void vser_reset(VirtIODevice *vdev)
{
VirtIOSerial *vser;
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
guest_reset(vser);
}
static void virtio_serial_save(QEMUFile *f, void *opaque)
{
VirtIOSerial *s = opaque;
VirtIOSerialPort *port;
uint32_t nr_active_ports;
unsigned int i, max_nr_ports;
/* The virtio device */
virtio_save(&s->vdev, f);
/* The config space */
qemu_put_be16s(f, &s->config.cols);
qemu_put_be16s(f, &s->config.rows);
qemu_put_be32s(f, &s->config.max_nr_ports);
/* The ports map */
max_nr_ports = tswap32(s->config.max_nr_ports);
for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
qemu_put_be32s(f, &s->ports_map[i]);
}
/* Ports */
nr_active_ports = 0;
QTAILQ_FOREACH(port, &s->ports, next) {
nr_active_ports++;
}
qemu_put_be32s(f, &nr_active_ports);
/*
* Items in struct VirtIOSerialPort.
*/
QTAILQ_FOREACH(port, &s->ports, next) {
uint32_t elem_popped;
qemu_put_be32s(f, &port->id);
qemu_put_byte(f, port->guest_connected);
qemu_put_byte(f, port->host_connected);
elem_popped = 0;
if (port->elem.out_num) {
elem_popped = 1;
}
qemu_put_be32s(f, &elem_popped);
if (elem_popped) {
qemu_put_be32s(f, &port->iov_idx);
qemu_put_be64s(f, &port->iov_offset);
qemu_put_buffer(f, (unsigned char *)&port->elem,
sizeof(port->elem));
}
}
}
static void virtio_serial_post_load_timer_cb(void *opaque)
{
uint32_t i;
VirtIOSerial *s = opaque;
VirtIOSerialPort *port;
uint8_t host_connected;
VirtIOSerialPortClass *vsc;
if (!s->post_load) {
return;
}
for (i = 0 ; i < s->post_load->nr_active_ports; ++i) {
port = s->post_load->connected[i].port;
host_connected = s->post_load->connected[i].host_connected;
if (host_connected != port->host_connected) {
/*
* We have to let the guest know of the host connection
* status change
*/
send_control_event(s, port->id, VIRTIO_CONSOLE_PORT_OPEN,
port->host_connected);
}
vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
if (vsc->set_guest_connected) {
vsc->set_guest_connected(port, port->guest_connected);
}
}
g_free(s->post_load->connected);
qemu_free_timer(s->post_load->timer);
g_free(s->post_load);
s->post_load = NULL;
}
static int fetch_active_ports_list(QEMUFile *f, int version_id,
VirtIOSerial *s, uint32_t nr_active_ports)
{
uint32_t i;
s->post_load = g_malloc0(sizeof(*s->post_load));
s->post_load->nr_active_ports = nr_active_ports;
s->post_load->connected =
g_malloc0(sizeof(*s->post_load->connected) * nr_active_ports);
s->post_load->timer = qemu_new_timer_ns(vm_clock,
virtio_serial_post_load_timer_cb,
s);
/* Items in struct VirtIOSerialPort */
for (i = 0; i < nr_active_ports; i++) {
VirtIOSerialPort *port;
uint32_t id;
id = qemu_get_be32(f);
port = find_port_by_id(s, id);
if (!port) {
return -EINVAL;
}
port->guest_connected = qemu_get_byte(f);
s->post_load->connected[i].port = port;
s->post_load->connected[i].host_connected = qemu_get_byte(f);
if (version_id > 2) {
uint32_t elem_popped;
qemu_get_be32s(f, &elem_popped);
if (elem_popped) {
qemu_get_be32s(f, &port->iov_idx);
qemu_get_be64s(f, &port->iov_offset);
qemu_get_buffer(f, (unsigned char *)&port->elem,
sizeof(port->elem));
virtqueue_map_sg(port->elem.in_sg, port->elem.in_addr,
port->elem.in_num, 1);
virtqueue_map_sg(port->elem.out_sg, port->elem.out_addr,
port->elem.out_num, 1);
/*
* Port was throttled on source machine. Let's
* unthrottle it here so data starts flowing again.
*/
virtio_serial_throttle_port(port, false);
}
}
}
qemu_mod_timer(s->post_load->timer, 1);
return 0;
}
static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id)
{
VirtIOSerial *s = opaque;
uint32_t max_nr_ports, nr_active_ports, ports_map;
unsigned int i;
int ret;
if (version_id > 3) {
return -EINVAL;
}
/* The virtio device */
ret = virtio_load(&s->vdev, f);
if (ret) {
return ret;
}
if (version_id < 2) {
return 0;
}
/* The config space */
qemu_get_be16s(f, &s->config.cols);
qemu_get_be16s(f, &s->config.rows);
qemu_get_be32s(f, &max_nr_ports);
tswap32s(&max_nr_ports);
if (max_nr_ports > tswap32(s->config.max_nr_ports)) {
/* Source could have had more ports than us. Fail migration. */
return -EINVAL;
}
for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
qemu_get_be32s(f, &ports_map);
if (ports_map != s->ports_map[i]) {
/*
* Ports active on source and destination don't
* match. Fail migration.
*/
return -EINVAL;
}
}
qemu_get_be32s(f, &nr_active_ports);
if (nr_active_ports) {
ret = fetch_active_ports_list(f, version_id, s, nr_active_ports);
if (ret) {
return ret;
}
}
return 0;
}
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent);
static Property virtser_props[] = {
DEFINE_PROP_UINT32("nr", VirtIOSerialPort, id, VIRTIO_CONSOLE_BAD_ID),
DEFINE_PROP_STRING("name", VirtIOSerialPort, name),
DEFINE_PROP_END_OF_LIST()
};
#define TYPE_VIRTIO_SERIAL_BUS "virtio-serial-bus"
#define VIRTIO_SERIAL_BUS(obj) \
OBJECT_CHECK(VirtIOSerialBus, (obj), TYPE_VIRTIO_SERIAL_BUS)
static void virtser_bus_class_init(ObjectClass *klass, void *data)
{
BusClass *k = BUS_CLASS(klass);
k->print_dev = virtser_bus_dev_print;
}
static const TypeInfo virtser_bus_info = {
.name = TYPE_VIRTIO_SERIAL_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(VirtIOSerialBus),
.class_init = virtser_bus_class_init,
};
static void virtser_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
{
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev);
monitor_printf(mon, "%*sport %d, guest %s, host %s, throttle %s\n",
indent, "", port->id,
port->guest_connected ? "on" : "off",
port->host_connected ? "on" : "off",
port->throttled ? "on" : "off");
}
/* This function is only used if a port id is not provided by the user */
static uint32_t find_free_port_id(VirtIOSerial *vser)
{
unsigned int i, max_nr_ports;
max_nr_ports = tswap32(vser->config.max_nr_ports);
for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
uint32_t map, bit;
map = vser->ports_map[i];
bit = ffs(~map);
if (bit) {
return (bit - 1) + i * 32;
}
}
return VIRTIO_CONSOLE_BAD_ID;
}
static void mark_port_added(VirtIOSerial *vser, uint32_t port_id)
{
unsigned int i;
i = port_id / 32;
vser->ports_map[i] |= 1U << (port_id % 32);
}
static void add_port(VirtIOSerial *vser, uint32_t port_id)
{
mark_port_added(vser, port_id);
send_control_event(vser, port_id, VIRTIO_CONSOLE_PORT_ADD, 1);
}
static void remove_port(VirtIOSerial *vser, uint32_t port_id)
{
VirtIOSerialPort *port;
unsigned int i;
i = port_id / 32;
vser->ports_map[i] &= ~(1U << (port_id % 32));
port = find_port_by_id(vser, port_id);
/*
* This function is only called from qdev's unplug callback; if we
* get a NULL port here, we're in trouble.
*/
assert(port);
/* Flush out any unconsumed buffers first */
discard_vq_data(port->ovq, &port->vser->vdev);
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_REMOVE, 1);
}
static int virtser_port_qdev_init(DeviceState *qdev)
{
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev);
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
VirtIOSerialBus *bus = DO_UPCAST(VirtIOSerialBus, qbus, qdev->parent_bus);
int ret, max_nr_ports;
bool plugging_port0;
port->vser = bus->vser;
port->bh = qemu_bh_new(flush_queued_data_bh, port);
assert(vsc->have_data);
/*
* Is the first console port we're seeing? If so, put it up at
* location 0. This is done for backward compatibility (old
* kernel, new qemu).
*/
plugging_port0 = vsc->is_console && !find_port_by_id(port->vser, 0);
if (find_port_by_id(port->vser, port->id)) {
error_report("virtio-serial-bus: A port already exists at id %u",
port->id);
return -1;
}
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
if (plugging_port0) {
port->id = 0;
} else {
port->id = find_free_port_id(port->vser);
if (port->id == VIRTIO_CONSOLE_BAD_ID) {
error_report("virtio-serial-bus: Maximum port limit for this device reached");
return -1;
}
}
}
max_nr_ports = tswap32(port->vser->config.max_nr_ports);
if (port->id >= max_nr_ports) {
error_report("virtio-serial-bus: Out-of-range port id specified, max. allowed: %u",
max_nr_ports - 1);
return -1;
}
ret = vsc->init(port);
if (ret) {
return ret;
}
port->elem.out_num = 0;
QTAILQ_INSERT_TAIL(&port->vser->ports, port, next);
port->ivq = port->vser->ivqs[port->id];
port->ovq = port->vser->ovqs[port->id];
add_port(port->vser, port->id);
/* Send an update to the guest about this new port added */
virtio_notify_config(&port->vser->vdev);
return ret;
}
static int virtser_port_qdev_exit(DeviceState *qdev)
{
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, qdev);
VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
VirtIOSerial *vser = port->vser;
qemu_bh_delete(port->bh);
remove_port(port->vser, port->id);
QTAILQ_REMOVE(&vser->ports, port, next);
if (vsc->exit) {
vsc->exit(port);
}
return 0;
}
VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *conf)
{
VirtIOSerial *vser;
VirtIODevice *vdev;
uint32_t i, max_supported_ports;
if (!conf->max_virtserial_ports)
return NULL;
/* Each port takes 2 queues, and one pair is for the control queue */
max_supported_ports = VIRTIO_PCI_QUEUE_MAX / 2 - 1;
if (conf->max_virtserial_ports > max_supported_ports) {
error_report("maximum ports supported: %u", max_supported_ports);
return NULL;
}
vdev = virtio_common_init("virtio-serial", VIRTIO_ID_CONSOLE,
sizeof(struct virtio_console_config),
sizeof(VirtIOSerial));
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
/* Spawn a new virtio-serial bus on which the ports will ride as devices */
qbus_create_inplace(&vser->bus.qbus, TYPE_VIRTIO_SERIAL_BUS, dev, NULL);
vser->bus.qbus.allow_hotplug = 1;
vser->bus.vser = vser;
QTAILQ_INIT(&vser->ports);
vser->bus.max_nr_ports = conf->max_virtserial_ports;
vser->ivqs = g_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
vser->ovqs = g_malloc(conf->max_virtserial_ports * sizeof(VirtQueue *));
/* Add a queue for host to guest transfers for port 0 (backward compat) */
vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input);
/* Add a queue for guest to host transfers for port 0 (backward compat) */
vser->ovqs[0] = virtio_add_queue(vdev, 128, handle_output);
/* TODO: host to guest notifications can get dropped
* if the queue fills up. Implement queueing in host,
* this might also make it possible to reduce the control
* queue size: as guest preposts buffers there,
* this will save 4Kbyte of guest memory per entry. */
/* control queue: host to guest */
vser->c_ivq = virtio_add_queue(vdev, 32, control_in);
/* control queue: guest to host */
vser->c_ovq = virtio_add_queue(vdev, 32, control_out);
for (i = 1; i < vser->bus.max_nr_ports; i++) {
/* Add a per-port queue for host to guest transfers */
vser->ivqs[i] = virtio_add_queue(vdev, 128, handle_input);
/* Add a per-per queue for guest to host transfers */
vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output);
}
vser->config.max_nr_ports = tswap32(conf->max_virtserial_ports);
vser->ports_map = g_malloc0(((conf->max_virtserial_ports + 31) / 32)
* sizeof(vser->ports_map[0]));
/*
* Reserve location 0 for a console port for backward compat
* (old kernel, new qemu)
*/
mark_port_added(vser, 0);
vser->vdev.get_features = get_features;
vser->vdev.get_config = get_config;
vser->vdev.set_config = set_config;
vser->vdev.set_status = set_status;
vser->vdev.reset = vser_reset;
vser->qdev = dev;
vser->post_load = NULL;
/*
* Register for the savevm section with the virtio-console name
* to preserve backward compat
*/
register_savevm(dev, "virtio-console", -1, 3, virtio_serial_save,
virtio_serial_load, vser);
return vdev;
}
void virtio_serial_exit(VirtIODevice *vdev)
{
VirtIOSerial *vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
unregister_savevm(vser->qdev, "virtio-console", vser);
g_free(vser->ivqs);
g_free(vser->ovqs);
g_free(vser->ports_map);
if (vser->post_load) {
g_free(vser->post_load->connected);
qemu_del_timer(vser->post_load->timer);
qemu_free_timer(vser->post_load->timer);
g_free(vser->post_load);
}
virtio_cleanup(vdev);
}
static void virtio_serial_port_class_init(ObjectClass *klass, void *data)
{
DeviceClass *k = DEVICE_CLASS(klass);
k->init = virtser_port_qdev_init;
k->bus_type = TYPE_VIRTIO_SERIAL_BUS;
k->exit = virtser_port_qdev_exit;
k->unplug = qdev_simple_unplug_cb;
k->props = virtser_props;
}
static const TypeInfo virtio_serial_port_type_info = {
.name = TYPE_VIRTIO_SERIAL_PORT,
.parent = TYPE_DEVICE,
.instance_size = sizeof(VirtIOSerialPort),
.abstract = true,
.class_size = sizeof(VirtIOSerialPortClass),
.class_init = virtio_serial_port_class_init,
};
static void virtio_serial_register_types(void)
{
type_register_static(&virtser_bus_info);
type_register_static(&virtio_serial_port_type_info);
}
type_init(virtio_serial_register_types)
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